Malco D6AST Standard Dampers 28 Gauge Dampers, 6", Locking Wingnuts, 100 Packs Pre Assembled
1/4" (6.4 mm) bearings allow bearing holes to be made in round duct with the use of a scratch awl. Squeeze pipe so that it is oval shaped. Insert damper into pre-punched bearing hole(s). Pipe will spring back to round when released. Secure with wing nut(s) provided. Damper may be adjusted with screwdriver or optional damper handle.
- Malco Dampers are designed for forced air systems, they are not capable of being used in wood coal, or other similar systems.